It’s True! The Archimedean Screw is Fish-friendly.

Archimedean Screws are the preferred hydro-turbine for the development of low head sites. They provides a fish-friendly alternative to conventional turbines and sites with fish protection issues.

As a renewable energy company that cares about environment we have done our research on all our products before taking them on board and are happy with the test results proving that the Archimedean Screw is in fact fish-friendly.

Fyke Net at oveflow

Fyke Net at oveflow

Fish Passage Testing:

Extensive fish passage tests have conclusively demonstrated that the large water chambers and slow rotation of the Archimedean Screw allow fish of all sizes, and debris safe passage through the turbine. As a result, the Environment Agency has agreed that no screening is required. Literally thousands of fish passages have been monitored and recorded using underwater cameras at the intake, inside the chamber of the Screw itself and at the outflow to assess the effect of the Screw on salmonids (including smolts and kelts), brown trout and eels.

Salmon smolt caught passing naturally downstream through the turbine

Salmon smolt caught passing naturally downstream through the turbine

Fish Passage Test Results Phase 1

Fish Passage Test Results Phase 2

Fish Passage Test results Phase 3

73cm Pike after passing through the turbine

73cm Pike after passing through the turbine

The trials looked at fish passage across a broad spectrum of sizes and turbine speeds, possibly the most impressive of which was the safe passage of a kelt measuring 98cm in length and weighing 7.6kg. In addition, behavioural and migrational patterns across the species have been shown to be entirely unaffected by the turbine. The implication of these findings is extremely positive for the economics of micro-hydro. Sites previously written off for hydro development owing to fish protection issues can be revisited, and the cost of installation for an Archimedean Screw turbine will be significantly reduced by the requirement for only minimal screening.

New recommendations in place for the UK:

Although over 100 screw turbine systems are currently operational on the continent, with no reported fisheries issues or problems, in the UK recommendations are in place to reduce the risk of Archimedean Screws even further.

Rubber bumper on leading edge of the Archimedean Screw

Rubber bumper on leading edge of turbine blade

Work by Fishtek Consulting  on risk of injury should a fish be struck by the leading edge of a turbine led to the recommendation that in order to minimise the risk of injury, the leading edges of small Archimedean Screws under 2.5m in diameter should be fitted with rubber bumpers and larger turbines with fish friendly compressible bumpers to mitigate the effects of higher inpact speeds on the largest screw turbines in use. These bumpers are now required as standard on larger Archimedean Screws.

For full report see: Archimedean Screw Risk Assessment: Strike and delay Probabilities

Rubber bumper attached to leading edge of the Archimedean Screw

Rubber bumper attached to leading edge of turbine blade

 

Photographs copyright  Fishtek and Mannpower Consulting Ltd.,

Please Note: All the reports are copyright and may not be used for commercial purposes without the prior consent of Mannpower Consulting Ltd.

 

Farmers show interest in Micro-hydro power.

In a suitable location small-scale hydropower is one of the most cost-effective and reliable of the renewable energy technologies.   It has several advantages over wind and solar power, with a high level of predictability, varying with annual rainfall patterns. It is a long-lasting and robust technology and systems can readily be engineered to last for 50 years or more.

Those attending were given an understanding of the principles of micro-hydro, connecting to the Grid and the economics of potential systems. Eoin was then able to demonstrate the plant on Ballynalough Farm.

Renewable Energy Event at CAFRE’s Enniskillen Campus on 22 February 2012:

Organising committee. From left: Gareth Gormley, DARD, Connor Maguire, CAFRE, Lindsay Easson, AFBI, Kieran Coulter, DARD, Eric Long and David Trimble, CAFRE.

For those  interested in energy from micro-hydro and other renewable technologies, DARD, in conjunction with the Ulster Farmers’ Union  and Agri-Food and Biosciences Institute are running another Practical On-farm Renewable Energy Event, this time at CAFRE’s Enniskillen Campus on Wednesday 22 February from 1.30pm through to 10.00pm.

The Fair is open FREE of charge to anyone in the farming and rural sector who are interested in reducing their costs through adopting more energy efficient practices and will provide a platform to network, source, meet suppliers and keep up-to-date on energy-saving systems and renewable technologies.

There will again be a series of seminars throughout the day on each of the main renewable energy technologies; wind power, biomass production and utilisation, anaerobic digestion, solar hot water, micro-hydro, and heat pumps.

A second series of seminars will deal with many of the issues facing those considering a green energy source. Topics covered will include the proposed Renewable Heat Incentive (RHI), grid connection, planning, NI Renewable Obligation Certificates (NIROC’s), business planning, taxation, as well as finance and funding options.

In addition there will be a Trade Exhibition and the opportunity to see the biomass boiler installation at Enniskillen campus. For further details contact Connor Maguire at 028 6634 4853 or connor.maguire@dardni.gov.uk

Hydro projects in Northern Ireland: 

The first ever Archimedean Screw generator in Northern Ireland was only recently installed at Shane’s Castle in Antrim. Rated at 214 kilowatts this is the largest single Archimedean Screw generator ever manufactured. It is now fully commissioned  fully operational.

The predicted annual output is a massive 1,125,000 kilowatt-hours. To put this in perspective, an average household uses less than 5,000 kilowatt-hours per year, so this hydro scheme has the potential to power more than 225 houses. This scheme will also save an impressive 484 tonnes or more of Carbon Dioxide (CO2) emissions by generating clean, green electricity.

Shane’s Castle Hydro Project, Antrim

Omagh District Council  are  utilising the weir on the Camowen River, adjacent to Omagh Leisure Complex, to generate electricity through an Archimedean Screw hydro turbine. This hydro project is the second of only two Archimedean Screw hydro projects to date in Northern Ireland. The development of the hydro scheme on the Camowen River will generate sufficient power to meet the needs of Omagh Leisure Complex with excess electricity sold back to the national grid. Rated at 121 kilowatts the hydro turbine is predicted to save in excess of 133 tonnes of Carbon Dioxide (CO2) annually. It is expected that this project will be fully commissioned and operational in the coming weeks.

Omagh Hydro Project, Tyrone

We look forward to meeting you at the show.

We offer a friendly one-stop shop for hydro development, from feasibility studies to licensing, to installation and commissioning and everything in between.

 

 

Practical On-farm Renewable Energy event at CAFRE’s Greenmount Campus 1st November 2011

Representatives from DARD, UFU and AFBI at the meeting to launch the Practical On-farm Renewable Energy event

Following on from its success in 2010, the “Practical On-farm Renewable Energy” event will be held once again on Tuesday 1st  November 2011 at Greenmount Campus. The event will run from 11.00am until 9.00pm in the evening.

DARD has again joined forces with the Ulster Farmers Union (UFU), and the Agri-Food and Biosciences Institute (AFBI) to provide practical information for farmers and the rural sector about the various renewable energy options available for their businesses.

There will be a series of seminars throughout the day on each of the main renewable energy technologies; wind power, biomass production and utilisation, anaerobic digestion, solar hot water, micro-hydro and heat pumps.

A second series of seminars will deal with many of issues facing those considering installing a green energy source. Topics covered will include the proposed Renewable Heat Incentive (RHI), grid connection, planning, NI Renewable Obligation Certificates (NIROC’s), marketing NIROC’s as well as finance and funding options.

In addition there will be a Trade Exhibition and the opportunity to tour the renewable energy installations at Greenmount Campus.

If you are interested in exhibiting in the trade stand area please contact CAFRE at technology.admin@dardni.gov.uk or telephone 028 9442 6770. As space is limited it will be allocated on a first come first served basis.

For further details contact David Trimble at 028 9442 6682 or david.trimble@dardni.gov.uk.

As a result of feedback from attendees last year, a follow-up event will also be held at CAFRE’s Enniskillen Campus on 22 February 2012.

 

Seminar programme for CAFRE, 1 November 2011

 

Start Time Technology Seminar Speaker Meeting the Challenges Speaker
11.30 On-farm Energy Efficiency David Trimble Funding Gareth Gormley
12.00 Biomass

  • Production
  • Utilisation
  • Economics
  • RHI
  • Case study
 Alistair McCrackenLindsay EassonPeter Hutchinson

Simon Best

Grid connection Gerry Hodgkinson
12.30 Finance Trevor Finlay
13.00 Planning Permission Planning Service
13.30 Solar hot water Martin Mulholland Taxation Anne Douglas
14.00 AD 

  • Technology
  • Planning
  • Grid & PPA
  • Finance
  • Case study
  Nigel MoorePlanner

Andy McCrea

Trevor Finlay

Jim Torney

Renewable Heat Incentive Peter Hutchinson
14.30 NIROCs Michael Harris
15.00 Funding Gareth Gormley
15.30 Planning Permission Planning Service
16.00 Micro-hydro Eoin McCambridge Marketing NIROCs Jonathan Buick
16.30 Heat pumps David Trimble Grid connection Gerry Hodgkinson
17.00 Solar PV Greg Forbes Taxation Anne Douglas
17.30 Solar hot water Martin Mulholland Planning Permission Planning Service
18.00 Micro-hydro Eoin McCambridge Funding Gareth Gormley
18.30 Heat Pumps David Trimble NIROCs Michael Harris
19.00 Wind

  • Technology
  • Planning
  • Grid & PPA
  • Finance
  • Taxation
  • Case study
 Anita WattsPlannerAndy McCrea

Trevor Finlay

Anne Douglas

James Carson

RHI Peter Hutchinson
19.30    
20.00    

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Archimedean Screw Hydro Turbine – Old Technology New Application

The Archimedes Screw has been used for pumping water for over 2000 years. Applying the principle in reverse, the same equipment now offers a new method for generating power from water, providing a fish friendly and highly efficient alternative to a conventional turbine.

Each Archimedean Screw hydropower system is manufactured to be site-specific, with a choice of three designs – steel trough, closed compact and open compact – depending on which is the most appropriate and cost-effective for each individual site.

Closed Compact –  Key Benefits:

  •  Screw + trough + gearbox + generator are all assembled into a single unit at the factory.
  • Civil works on site reduced to a minimum.
  •  Installation time considerably reduced (approx 3-4 hours)

 Open Compact – Key Benefits:

  • Manufactured as a self-supporting U-shaped steel construction minimising necessary civils work on site.
  • Generator unit is an integral part of the construction, easily accessible via a weatherproof, hinged generator cover.

 Steel Trough – Key Benefits:

  •  Concrete foundation cast in situ.
  • Screw is supplied complete with its steel plate trough
  • Backed up with concrete after assembly and alignment.
  • Optimum clearance between trough and screw is guaranteed.
  • Civil works on site are reduced.

Closed Compact

Open Compact

Steel Trough

Eco Evolution are appointed agents in Ireland of Mann Power Consulting Ltd (UK) who specialise in the Archimedean Screw hydro turbine. The Archimedean screw hydro turbines are suited to low-head sites and are fish friendly.

As pioneers of Archimedean screw generating installations in the UK and Ireland, Mann Power believe that Rehart manufacture the best equipment on the market.

Archimedean Screw Hydro Turbine – Fish friendly generation

Archimedean Screw – Fish-friendly generation

What site?
·  Fall (head) of 1m to 10m
·  Flow from 100 l/s to 10,000 l/s

Why an Archimedean Screw?
·  High level of efficiency maintained across a wide flow variation
·  Environment Agency approved
·  No need for expensive fine screening
·  Robust, simple machinery – low maintenance
·  Minimal construction work necessary
·  Dry running and debris in the water flow do not harm the machinery
·  No complex control system required
·  Design life: 25 – 40 years

Efficiency
·  Achieves an efficiency of up to 87%
·  ‘Water to wire’ efficiency of 77%
·  Highly efficient down to 20% of maximum flow

Steel Trough

Steel Trough

Fish friendly
Extensive fish passage tests have conclusively demonstrated that the large water chambers and slow rotation of the Archimedean Screw allow fish of all sizes, and debris safe passage through the turbine. As a result, the Environment Agency has agreed that no screening is required. Literally thousands of fish passages have been monitored and recorded using underwater cameras at the intake, inside the chamber of the Screw itself and at the outflow to assess the effect of the Screw on salmonids (including smolts and kelts), brown trout and eels. The trials looked at fish passage across a broad spectrum of sizes and turbine speeds, possibly the most impressive of which was the safe passage of a kelt measuring 98cm in length and weighing 7.6kg. In addition, behavioural and migrational patterns across the species have been shown to be entirely unaffected by the turbine. The implication of these findings is extremely positive for the economics of micro-hydro. Sites previously written off for hydro development owing to fish protection issues can be revisited, and the cost of installation for an Archimedean Screw turbine will be significantly reduced by the requirement for only minimal screening.

Fish friendly Archimedean Screw hydro turbine

Fish friendly Archimedean Screw hydro turbine

One year on -a customer testimonial
Mark Simpson, owner of the River Dart Country Park at Ashburton in Devon decided to install an Archimedean screw to replace an old Kaplan system which had been beset by problems in the past. “The screw suits this environment so well, particularly given the vagaries of the River Dart and the way that it copes with the debris and leaves which were a problem with the old Kaplan system.” The new system produces a maximum of 48kW, more than enough to run all the visitor facilities on site, Holme Park House (used as a conference centre and wedding venue) plus two visitor bungalows. “We have been running through the summer at pretty near full capacity (45-48kW). During the dry spell it did drop down to 35kW, purely because of the limited amount of water we could take out of the river and down the leat.” Mark is a great advocate of the Archimedean screw as a satisfied customer: “The power output is more than I budgeted for or envisaged in the planning stages and I’m delighted at how the whole scheme has come together”.